Stock Trading History of Michelson David W

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Michelson David W since year 2005. The trader's CIK number is 1306400. At the time of this reporting, Michelson David W is the Executive VP and COO of National Interstate Corp (stock ticker symbol NATL).

Stock purchases, sales, and option exercises reported by *Michelson David W* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2006-09-26	NATL	National Interstate Corp	Sale	701	27.00	18,927
2006-09-21	NATL	National Interstate Corp	Option Exercise	10,000	13.50	135,000
2006-09-06	NATL	National Interstate Corp	Sale	3,396	27.85	94,578
2006-09-05	NATL	National Interstate Corp	Sale	10,268	28.05	288,017
2006-09-07	NATL	National Interstate Corp	Sale	1,604	27.50	44,110

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Michelson David W (Executive VP and COO of National Interstate Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.